The thickness of photoresist applied to wafers in semiconductor manufacturing at a particular on the wafer is uniformly distributed between 0.2035 and 0.2161 micrometers.

a) Determine the proportion of wafers that exceeds 0.2125 micrometers of photoresist thickness

Question

The thickness of photoresist applied to wafers in semiconductor manufacturing at a particular on the wafer is uniformly distributed between 0.2035 and 0.2161 micrometers.

a) Determine the proportion of wafers that exceeds 0.2125 micrometers of photoresist thickness

perl · Answer

Did you try to use a uniform distribution for this problem?

anonymous · Answer

i tried this,
$$f(x)=\frac{ 1 }{ (0.2161-0.2035 )}$$
$$f(x)=\frac{ 5000 }{ 63 }$$

but i don't know the limits for the integral and i'm not sure if this is correct

perl · Answer

the limit is from .2125 to the end of the domain .2161

anonymous · Answer

$$\int\limits_{0.2125}^{0.2161}\frac{ 5000 }{ 63 }$$

the answer is 0.2857

perl · Answer

that's right

anonymous · Answer

Yes! Thank you so much! :)